JP6116735B1 - Range switching device - Google Patents

Abstract

A range switching device that can be reduced in size is obtained. In a range switching device, an output shaft of a range switching unit is disposed at a position away from a motor shaft in a radial direction. The plate 371 that is a magnetic member of the speed reduction mechanism unit 22 faces the rotor 29 and the stator 28 of the motor 21 in the axial direction of the motor 21. The substrate 24 is provided with an output shaft sensor 44 that faces the end surface of the output shaft 231 in the axial direction. The housing 25 has a case 272 that is a magnetic member. The case 272 has a case peripheral wall portion 272 b that covers the outer peripheral portion of the stator 28. A magnetic circuit component 51, which is a magnetic member, is provided between the case peripheral wall 272b and the plate 371. [Selection] Figure 2

Description

  The present invention relates to a range switching device that switches a shift range in accordance with, for example, an operation of a shift lever.

  Conventionally, in order to change the shift range of the transmission, the output shaft is connected to the motor shaft via the speed reduction mechanism, and the rotation of the motor decelerated by the speed reduction mechanism is achieved by connecting the output shaft to the transmission shift shaft. There is known a range switching device in which an output shaft and a shift shaft are rotated by force. In such a conventional range switching device, a non-contact type magnetic sensor is arranged at a position facing the axial end surface of the output shaft, and the rotation position of the output shaft is detected by the non-contact type magnetic sensor. Thus, the consistency of the operation of the output shaft with respect to the command value from the external control unit can be confirmed (for example, see Patent Document 1).

JP 2015-200347 A

  However, in the conventional range switching device disclosed in Patent Document 1, it is necessary to increase the distance from the motor to the magnetic sensor so that the magnetic sensor is not affected by the leakage magnetic flux from the motor. This increases the size of the range switching device.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a range switching device that can be miniaturized.

  A range switching device according to the present invention includes a motor having a stator, a rotor that can rotate with respect to the stator, and a motor shaft that rotates integrally with the rotor, and an output shaft that is disposed radially away from the motor shaft. A range switching unit having a plate that is a magnetic member facing each of the rotor and the stator in the axial direction of the motor and decelerating the rotation of the motor shaft to transmit the rotational force of the motor shaft to the output shaft; A substrate on which an output shaft sensor, which is a non-contact magnetic sensor facing the axial end surface of the output shaft, is provided, and a motor, a range switching unit, a reduction mechanism unit, and a housing that supports the substrate. It has a case that is a magnetic member with a case peripheral wall covering the outer periphery of the stator, and between the case peripheral wall and the plate Magnetic circuit component is provided as a magnetic member.

  According to the range switching device of the present invention, the magnetic flux emitted from the stator to the case peripheral wall portion can be put into the rotor via the magnetic circuit components and the plate, and the amount of leakage magnetic flux leaking from the motor to the output shaft sensor can be reduced. Can be reduced. Thereby, the sensor for output shafts can be brought close to the motor shaft, and the range switching device can be miniaturized.

It is a typical perspective view which shows the range switching system by Embodiment 1 of this invention. It is sectional drawing which shows the range switching apparatus of FIG. It is a partially broken perspective view which shows the range switching apparatus when it sees from the deceleration mechanism part side of FIG. It is sectional drawing which shows the range switching apparatus by Embodiment 2 of this invention. It is a partially broken perspective view which shows the range switching apparatus when it sees from the deceleration mechanism part side of FIG. It is sectional drawing which shows the board | substrate fixing | fixed part to which the board | substrate of the range switching apparatus by Embodiment 3 of this invention is fixed. It is sectional drawing which shows the board | substrate fixing | fixed part to which the board | substrate of the range switching apparatus by Embodiment 4 of this invention is fixed, and the component fixing | fixed part to which the arm part of a magnetic circuit component is being fixed. It is a partially broken perspective view which shows a state when the range switching apparatus by Embodiment 5 of this invention is seen from the deceleration mechanism part side. It is sectional drawing along the IX-IX line of FIG. It is sectional drawing which shows the range switching apparatus by Embodiment 6 of this invention. It is sectional drawing which shows the range switching apparatus by Embodiment 7 of this invention. It is sectional drawing which shows the range switching apparatus by Embodiment 8 of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 is a schematic perspective view showing a range switching system according to Embodiment 1 of the present invention. The range switching system 1 includes a range switching device 2, a detent device 3, a parking device 4, and a valve device 5.

  The range switching device 2 is attached to, for example, an automatic transmission mounted on a vehicle. The range switching device 2 is provided with a connector 2a. The connector 2a is supplied with a shift signal that is an electrical signal corresponding to a shift range selected by the driver operating the shift lever.

  The detent device 3 includes a shift shaft 6, a fan-shaped detent plate 7 attached to the shift shaft 6, and a detent spring 8 pressed against the detent plate 7.

  The shift shaft 6 is connected to the range switching device 2. The range switching device 2 rotates the shift shaft 6 and the detent plate 7 as a unit within a certain angle range based on the shift signal. A plurality of recesses 7 a are provided at the fan-shaped tip of the detent plate 7. The plurality of recesses 7a correspond to a plurality of shift ranges (P, R, N, D). The detent spring 8 is a leaf spring. The detent spring 8 holds the detent plate 7 at a shift range corresponding to the recess 7a by pressing the tip of the detent spring 8 against the recess 7a.

  The valve device 5 includes a valve rod 9 connected to the detent plate 7, a valve body 10 provided with a plurality of oil passages, and a spool valve 11 provided in the valve rod 9 and disposed in the valve body 10. And have.

  The valve rod 9 reciprocates according to the rotation of the detent plate 7. The spool valve 11 moves in the valve body 10 in accordance with the reciprocating movement of the valve rod 9. Thereby, the oil path in the valve body 10 is switched, and a shift range corresponding to the position of the detent plate 7 is set. The detent spring 8 is attached to the valve body 10.

  The parking device 4 includes a parking rod 12 connected to the detent plate 7, a conical portion 13 provided at the tip of the parking rod 12, a parking pole 14, and a parking gear 15.

  A plurality of recesses 15 a are formed on the outer periphery of the parking gear 15 at intervals. The parking pole 14 is rotatable about a shaft 14a. One end of the parking pole 14 is in contact with the inclined surface of the conical portion 13, and a protrusion 14 b is provided on the other end of the parking pole 14.

  The parking rod 12 and the conical portion 13 are displaced according to the rotation of the detent plate 7. The parking pole 14 rotates about the shaft 14 a according to the displacement of the conical portion 13. The protrusion 14b is fitted into the recess 15a or detached from the recess 15a by the rotation of the parking pole 14 according to the displacement of the conical portion 13. In the range switching system 1, the parking device 4 is locked or unlocked by the protrusion 14 b fitting or disengaging from the recess 15 a, and the rotation or rotation of the output member in the transmission can be prevented or executed.

  Therefore, in the range switching system 1, by controlling the rotation angle of the shift shaft 6, the position of the spool valve 11 with respect to the valve body 10 is controlled, and the shift range can be set.

  FIG. 2 is a cross-sectional view showing the range switching device 2 of FIG. 3 is a partially broken perspective view showing the range switching device 2 when viewed from the speed reduction mechanism side of FIG. The range switching device 2 includes a motor 21, a reduction mechanism unit 22 connected to the motor 21, a range switching unit 23 connected to the reduction mechanism unit 22, and a substrate 24 that controls the motor 21 based on a shift signal. And a motor 25, a speed reduction mechanism unit 22, a range switching unit 23, and a housing 25 that supports the substrate 24.

  The housing 25 accommodates the motor 21, the speed reduction mechanism unit 22, the range switching unit 23, and the substrate 24. The housing 25 has a front body 26 and a rear body 27 combined in a state of facing each other in the axial direction of the motor 21.

  The front body 26 is a resin body having a cylindrical shaft support portion 26a. The rear body 27 includes a resin-made rear body main body 271 provided with the connector 2 a shown in FIG. 1 and a metal case 272 that is a magnetic member integrated with the rear body main body 271.

  The case 272 is integrated with the rear body main body 271 by insert molding. The case 272 also includes a case bottom 272a and a cylindrical case peripheral wall 272b provided on the outer periphery of the case bottom 272a. A recess 272c is provided at the center of the case bottom 272a.

  The motor 21 includes a cylindrical stator 28, a rotor 29 that can rotate inside the stator 28, and a motor shaft 30 that passes through the rotor 29 and rotates integrally with the rotor 29. The stator 28, the rotor 29, and the motor shaft 30 are arranged coaxially. In this example, the motor 21 is a permanent magnet type brushless motor.

  The stator 28 includes a cylindrical stator core 281 that is a magnetic member, and a plurality of stator coils 282 provided on the stator core 281.

  The stator core 281 is fixed in the case peripheral wall portion 272b. Thereby, the case peripheral wall portion 272 b covers the outer peripheral portion of the stator 28. In this example, the stator 28 is fixed to the case 272 in a state where the stator core 281 is press-fitted into the case peripheral wall portion 272b.

  The stator core 281 is a stacked body in which a plurality of magnetic plates are stacked in the axial direction of the motor 21. Further, as shown in FIG. 3, the stator core 281 has a cylindrical core back 281a and a plurality of core cores 281a that protrude radially inward from the core back 281a and are spaced apart from each other in the circumferential direction of the core back 281a. Teeth 281b. In this example, the teeth 281 b are arranged every 30 degrees in the circumferential direction of the stator 28. In this example, U-phase, V-phase, and W-phase stator coils 282 are provided on a plurality of teeth 281b, and the connection of each stator coil 282 is a three-phase star connection.

  The rotor 29 has a rotor core 291 that is a magnetic member, and a plurality of magnets 292 provided on the rotor core 291. The rotor core 291 is a stacked body in which a plurality of magnetic plates are stacked in the axial direction of the motor 21. Each magnet 292 is fixed in the rotor core 291 with an adhesive or the like.

  The motor shaft 30 is fixed to the rotor core 291 by press fitting. Further, as shown in FIG. 2, the motor shaft 30 protrudes from the rotor 29 and is inserted into the speed reduction mechanism portion 22. The motor shaft 30 is rotatably supported by the speed reduction mechanism unit 22 via the first bearing 31 and is rotatably supported by the case 272 via the second bearing 32. The second bearing 32 is fitted in the recess 272 c of the case 272. Each of the first bearing 31 and the second bearing 32 is a rolling bearing.

  The range switching unit 23 has an output shaft 231. The output shaft 231 is disposed at a position away from the motor shaft 30 in the radial direction. Further, the axis of the output shaft 231 is parallel to the axis of the motor shaft 30. The axis of the output shaft 231 is disposed at a position farther from the motor shaft 30 than the case peripheral wall portion 272 b when viewed along the axial direction of the motor 21.

  The output shaft 231 is passed through the shaft support portion 26 a of the front body 26. Further, the output shaft 231 is rotatably supported by the shaft support portion 26 a via the third bearing 33. The third bearing 33 is a sliding bearing. The output shaft 231 is connected to the shift shaft 6 shown in FIG.

  A sealing groove 231 a is provided in the circumferential direction of the output shaft 231 on the outer peripheral portion of the output shaft 231. A gap between the outer peripheral surface of the output shaft 231 and the inner peripheral surface of the shaft support portion 26a is closed in an airtight or liquid-tight manner by a sealing material 34 fitted in the sealing groove 231a.

  The speed reduction mechanism unit 22 is configured by meshing a plurality of gears included in each of the planetary gear mechanism and the spur gear mechanism. That is, the speed reduction mechanism 22 is a sun gear 35 that is integrated with the motor shaft 30, a resin-made annular internal gear 36 that surrounds the sun gear 35, and a magnetic member that fixes the internal gear 36 in the housing 25. A plurality of planetary gears 38 arranged between a certain internal gear fixing member 37, the sun gear 35 and the internal gear 36 and meshing with each of the sun gear 35 and the internal gear 36, and the tip portion 30 a of the motor shaft 30 are rotatable. Supported by the planetary gears 38, the small gear 40 integrated with the outer peripheral portion of the boss portion of the carrier 39, and the rotation fixed to the output shaft 231 and meshing with the small gear 40. And a gear 41.

  The sun gear 35 rotates integrally with the motor shaft 30. Each planetary gear 38 revolves around the sun gear 35 while rotating in accordance with the rotation of the motor shaft 30 in a state of being engaged with the sun gear 35 and the internal gear 36. The carrier 39 is rotatably provided at the distal end portion 30a of the motor shaft 30 via a fourth bearing 42 that is a sliding bearing. The carrier 39 rotates around the axis of the motor shaft 30 according to the revolution of each planetary gear 38. The small gear 40 rotates integrally with the carrier 39.

  The shape of the rotating gear 41 is a fan shape centered on the axis of the output shaft 231. Further, the rotation gear 41 is provided with an opening 41a. The small gear 40 is disposed in the opening 41 a of the rotating gear 41. A plurality of teeth that mesh with the small gear 40 are provided on the inner surface of the opening 41 a of the rotating gear 41 along the outer periphery of the rotating gear 41. The rotating gear 41 rotates within a certain angle range about the axis of the output shaft 231 in accordance with the rotation of the small gear 40. The output shaft 231 rotates integrally with the rotation gear 41 around the axis of the output shaft 231. Therefore, in this example, the final gear of the speed reduction mechanism unit 22 is the rotating gear 41.

  Accordingly, the speed reduction mechanism unit 22 reduces the rotation of the motor shaft 30 and transmits the rotational force of the motor shaft 30 to the output shaft 231. The output shaft 231 rotates around the axis of the output shaft 231 according to the rotation of the motor shaft 30. The shift shaft 6 rotates about the axis of the shift shaft 6 according to the rotation of the output shaft 231.

  The internal gear fixing member 37 is fixed in the housing 25. The internal gear fixing member 37 is integrated with the internal gear 36. Further, the internal gear fixing member 37 has a plate 371 that faces the stator 28 and the rotor 29 in the axial direction of the motor 21, and a cylindrical bearing fitting portion 372 that protrudes from the plate 371 toward the rotor 29. doing.

  The plate 371 is provided with a through hole through which the motor shaft 30 is passed. The bearing fitting portion 372 is disposed around the through hole of the plate 371. The first bearing 31 is supported by the internal gear fixing member 37 in a state of being fitted in the bearing fitting portion 372.

  The substrate 24 is disposed between each of the stator 28 and the rotor 29 and the output shaft 231 in the axial direction of the motor 21. Accordingly, a part of the substrate 24 is disposed between each of the stator 28 and the rotor 29 and the plate 371. In this example, one end of the substrate 24 faces the output shaft 231, and the other end of the substrate 24 faces the rotor 29.

  The substrate 24 is provided with a motor sensor 43 facing the axial end surface of the rotor 29 and an output shaft sensor 44 facing the axial end surface of the output shaft 231. The substrate 24 controls the motor 21 based on information from each of the motor sensor 43 and the output shaft sensor 44.

  The motor sensor 43 is a non-contact type hall sensor that detects a rotational position of the rotor 29 by detecting a change in the magnetic field by the magnet 292 of the rotor 29. By controlling the motor 21 based on information from the motor sensor 43, the rotor 29 can be rotated without the motor 21 stepping out. The axial dimension of the rotor 29 is larger than the axial dimension of the stator core 281. Thereby, the rotor 29 protrudes from the stator core 281 to the motor sensor 43 side.

  An output shaft magnet 45, which is a permanent magnet, is fixed to the end of the output shaft 231 on the output shaft sensor 44 side. The output shaft sensor 44 is a magnetic flux direction detection type non-contact magnetic sensor that detects a rotational position of the output shaft 231 by detecting a change in the magnetic field by the output shaft magnet 45.

  As shown in FIG. 3, the rear body main body 271 is provided with a resin substrate fixing portion 271 a that protrudes from the rear body main body 271. The board | substrate 24 is being fixed to the board | substrate fixing | fixed part 271a with the some screw | thread 46 which is a fastener.

  A magnetic circuit component 51, which is a magnetic member, is provided between the case peripheral wall portion 272 b of the case 272 and the plate 371. The shape of the magnetic circuit component 51 is a cylindrical shape centered on the axis of the motor shaft 30 when viewed along the axial direction of the motor 21. In other words, the magnetic circuit component 51 surrounds the entire circumference of the rotor when viewed along the axial direction of the motor 21. In this example, the case peripheral wall portion 272 b overlaps the magnetic circuit component 51 when viewed along the axial direction of the motor 21. In this example, the substrate 24 passes through the gap between the magnetic circuit component 51 and the plate 371.

  At least a part of the magnetic circuit component 51 is disposed between the motor sensor 43 and the output shaft sensor 44 when viewed along the axial direction of the motor 21. Thereby, at least a part of the magnetic circuit component 51 is disposed at a position closer to the case peripheral wall portion 272 b than the output shaft sensor 44 when viewed along the axial direction of the motor 21. The magnetic circuit component 51 intersects with a straight line connecting the axis of the motor shaft 30 and the output shaft sensor 44 when viewed along the axial direction of the motor 21. In the range switching device 2, a magnetic circuit that reaches the rotor 29 from the stator 28 through the case peripheral wall portion 272 b, the magnetic circuit component 51, the plate 371, and the bearing fitting portion 372 is configured.

  In this example, one end surface in the axial direction of the magnetic circuit component 51 faces the case peripheral wall portion 272b in the axial direction, and the other end surface in the axial direction of the magnetic circuit component 51 faces the plate 371 in the axial direction via the substrate 24. . The distance L1 between the magnetic circuit component 51 and the case peripheral wall portion 272b and the distance L2 between the magnetic circuit component 51 and the plate 371 are respectively determined from the output shaft sensor 44, the case peripheral wall portion 272b, the plate 371, and the magnetic field. The distance is less than or equal to each of the circuit components 51. As a result, the magnetic flux output from the outer periphery of the stator 28 to the case peripheral wall portion 272b enters the rotor 29 through the magnetic circuit component 51 and the internal gear fixing member 37, and the magnetic flux output from the stator 28 to the case peripheral wall portion 272b. Is looped to the rotor 29. Therefore, the leakage magnetic flux to the outside of the motor 21 is reduced. In this example, the distances from the output shaft sensor 44 to the case peripheral wall portion 272b, the plate 371, and the magnetic circuit component 51 are all the same distance L3 when viewed along the axial direction of the rotor 29. .

  As shown in FIG. 3, the magnetic circuit component 51 is provided with an arm portion 52 that protrudes from the magnetic circuit component 51. The rear body main body 271 is provided with a component fixing portion 271b that is a resin convex portion. The magnetic circuit component 51 is fixed to the component fixing portion 271b via the arm portion 52.

  In such a range switching device 2, the magnetic circuit component 51, which is a magnetic member, is disposed between the case peripheral wall portion 272 b, which is a magnetic member, and the plate 371, which is a magnetic member. The magnetic flux output to the part 272b can be put into the rotor 29 via the magnetic circuit component 51 and the plate 371, and the amount of leakage magnetic flux leaking from the motor 21 to the output shaft sensor 44 can be reduced. Accordingly, it is possible to make it difficult for the output shaft sensor 44 to be affected by the leakage magnetic flux from the stator 28, and the output shaft sensor 44 can be brought closer to the motor shaft 30. Therefore, the distance between the output shaft 231 and the motor shaft 30 when viewed along the axis of the motor 21 can be shortened, and the range switching device 2 can be downsized.

  In addition, since the rotation gear 41 that is the final stage gear of the speed reduction mechanism section 22 can be reduced in size, the inertia in the speed reduction mechanism section 22 can be reduced, and the controllability of the range switching device 2 can be improved. be able to.

  Further, since the magnetic circuit component 51 has a cylindrical shape centered on the axis of the motor shaft 30 when viewed along the axial direction of the motor 21, the magnetic circuit component 51 is more reliably supplied with magnetic flux from the stator 28. The magnetic circuit component 51 can be easily manufactured.

  Further, the distance L1 between the magnetic circuit component 51 and the case 272 and the distance L2 between the magnetic circuit component 51 and the plate 371 are respectively determined from the output shaft sensor 44, the case peripheral wall portion 272b, the plate 371, and the magnetic field. Since the distance is less than or equal to each of the circuit components 51, the magnetic flux from the stator 28 can be more reliably passed through the magnetic circuit components 51, and the influence of leakage magnetic flux on the output shaft sensor 44 can be further reduced. it can. Thereby, size reduction of the range switching apparatus 2 can further be achieved.

Embodiment 2. FIG.
4 is a cross-sectional view showing a range switching apparatus 2 according to Embodiment 2 of the present invention. FIG. 5 is a partially broken perspective view showing the range switching device 2 when viewed from the speed reduction mechanism 22 side of FIG. In the present embodiment, when the magnetic circuit component 51, which is a magnetic member, is viewed along the axial direction of the motor 21, the shape of the magnetic circuit component 51 is an arc shape centered on the axis of the motor shaft 30. Further, the magnetic circuit component 51 is disposed at a position closer to the case peripheral wall portion 272 b than the output shaft sensor 44 when viewed along the axial direction of the motor 21. Further, the magnetic circuit component 51 as viewed along the axial direction of the motor 21 intersects with a straight line connecting the axis of the motor shaft 30 and the output shaft sensor 44. The magnetic circuit component 51 is disposed only on the output shaft sensor 44 side as viewed from the motor shaft 30, and is not disposed on the opposite side of the output shaft sensor 44 side. Other configurations are the same as those in the first embodiment.

  In such a range switching device 2, the magnetic circuit component 51 has an arc shape centered on the axis of the motor shaft 30 when viewed along the axial direction of the motor 21. Can be facilitated, and the material cost of the magnetic circuit component 51 can be reduced. In addition, the weight of the magnetic circuit component 51 can be reduced.

Embodiment 3 FIG.
FIG. 6 is a cross-sectional view showing a substrate fixing part 271a to which the substrate 24 of the range switching device 2 according to the third embodiment of the present invention is fixed. The substrate 24 overlaps the substrate fixing portion 271 a of the rear body main body 271 through the arm portion 52 protruding from the magnetic circuit component 51. Each of the substrate 24 and the arm portion 52 is provided with a through hole for threading through which a screw 46 as a fastener is passed. The board | substrate 24 and the arm part 52 are being fixed to the board | substrate fixing | fixed part 271a with the common screw 46 passed through each through-hole of the board | substrate 24 and the arm part 52. FIG. That is, the arm portion 52 is fastened together with the substrate 24 to the substrate fixing portion 271 a of the housing 25 by the screw 46. Other configurations are the same as those in the first embodiment.

  In such a range switching device 2, since the arm portion 52 of the magnetic circuit component 51 is fastened together with the substrate 24 to the housing 25 by the screw 46, the number of components can be reduced.

Embodiment 4 FIG.
FIG. 7 shows a board fixing part 271a to which the board 24 of the range switching device 2 according to Embodiment 4 of the present invention is fixed, and a part fixing part 271b to which the arm part 52 of the magnetic circuit component 51 is fixed. It is sectional drawing. The board fixing part 271a to which the board 24 is fixed and the component fixing part 271b to which the arm part 52 is fixed are arranged apart from each other. The component fixing portion 271 b of the rear body main body 271 is a resin convex portion protruding from the rear body main body 271. The arm portion 52 is provided with a through hole. The tip of the component fixing part 271 b is passed through the through hole of the arm part 52. The tip of the component fixing portion 271b is a caulking portion 271c having a diameter larger than the inner diameter of the through hole of the arm portion 52. The arm portion 52 is fixed to the component fixing portion 271b by a caulking portion 271c. The caulking portion 271c is formed by heat caulking that applies heat and pressure to the tip portion of the component fixing portion 271b to deform the tip portion of the component fixing portion 271b. Other configurations are the same as those in the first embodiment.

  In such a range switching device 2, the tip of the component fixing portion 271b of the rear body main body 271 is a caulking portion 271c that fixes the arm portion 52 to the component fixing portion 271b. Therefore, the arm portion 52 is replaced with the component fixing portion 271b. Can be fixed easily. In addition, since a screw for fixing the arm portion 52 to the component fixing portion 271b is not necessary, the number of components can be reduced.

  Further, since the board fixing part 271a and the component fixing part 271b are arranged at positions separated from each other, each of the rotor 29 and the output shaft 231 is compared with the case where the board 24 and the arm part 52 are fixed together. Therefore, it is not necessary to consider the dimensional variation of the magnetic circuit component 51 in the accuracy of the position (that is, the height) of the substrate 24 with respect to. Thereby, management of the position of the motor sensor 43 with respect to the magnet 292 of the motor 21 and management of the position of the output shaft sensor 44 with respect to the output shaft magnet 45 can be facilitated.

  The selection of whether the arm portion 52 is fixed to the component fixing portion 271b with a screw or the caulking portion 271c depends on the amount of leakage magnetic flux generated by the motor 21 and the minimum detection magnetic flux of the output shaft sensor 44. On the other hand, it is performed according to the weight of the magnetic circuit component 51 necessary for the thickness and the holding force required depending on the conditions such as the vibration environment.

  Further, in the third and fourth embodiments, the structure of fastening by the screw 46 or the structure of fixing by the caulking portion 271c is applied to the arm portion 52 of the cylindrical magnetic circuit component 51 of the first embodiment. A structure of fastening by 46 or a structure of fixing by caulking portion 271c may be applied to the arm portion 52 of the arc-shaped magnetic circuit component 51 of the second embodiment.

Embodiment 5. FIG.
FIG. 8 is a partially broken perspective view showing a state when the range switching device 2 according to the fifth embodiment of the present invention is viewed from the speed reduction mechanism 22 side. FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. FIG. 8 corresponds to FIG. 3 in the first embodiment. The magnetic circuit component 51 is provided with a plurality of protrusions 53. The plurality of protrusions 53 are arranged at intervals in the circumferential direction of the magnetic circuit component 51. Each protrusion 53 protrudes from the magnetic circuit component 51 toward the substrate 24 along the axis of the motor 21.

  The substrate 24 is provided with a plurality of through holes 24a into which the protrusions 53 are individually inserted. The positions of the through holes 24 a are the positions of conductive lands provided in the substrate 24.

  As shown in FIG. 9, each protrusion 53 has a pedestal portion 53a and a protruding portion 53b that protrudes from the pedestal portion 53a. The protrusion 53b is thinner than the pedestal 53a. The inner diameter of each through-hole 24a is larger than the width dimension of the protrusion part 53b, and smaller than the width dimension of the base part 53a. Thereby, the size of each through hole 24a is such that the protruding portion 53b can pass therethrough and the passage of the pedestal portion 53a is blocked.

  The board | substrate 24 is mounted in the base part 53a in the state in which the protrusion part 53b was inserted in the through-hole 24a. Thereby, a gap exists between the substrate 24 and the magnetic circuit component 51. Further, the substrate 24 is fixed to the magnetic circuit component 51 by a soldering portion 54 interposed between the inner surface of the through hole 24a and the protruding portion 53b. The soldering portion 54 is fixed to the land of the substrate 24.

  The substrate 24 inserts the protruding portion 53b of the protrusion 53 into the through hole 24a and places the substrate 24 on the pedestal portion 53a, and then flows the melted solder into the gap between the inner surface of the through hole 24a and the protruding portion 53b. It is fixed to the magnetic circuit component 51 by curing. Other configurations are the same as those of the second embodiment.

  In such a range switching device 2, the protrusion 53 of the magnetic circuit component 51 is inserted into the through hole 24 a of the substrate 24, and the soldering portion 54 interposed between the inner surface of the through hole 24 a and the protrusion 53. Since the board | substrate 24 is being fixed to the magnetic circuit component 51, it becomes unnecessary to fix the magnetic circuit component 51 to the rear body main body 271 via the arm part 52, and can aim at reduction of a number of components. Further, since the arm portion 52 is eliminated, the weight of the range switching device 2 can be reduced by reducing the weight of the magnetic circuit component 51, and the shape of the magnetic circuit component 51 can be further simplified. The production of the component 51 can be facilitated.

  Further, the protrusion 53 provided on the magnetic circuit component 51 has a pedestal portion 53a and a protruding portion 53b protruding from the pedestal portion 53a, and the substrate 24 is in a state where the protruding portion 53b is inserted into the through hole 24a. Since it is placed on the pedestal 53a, the substrate 24 can be kept away from the end face of the magnetic circuit component 51. Thereby, it is possible to prevent the substrate 24 from being damaged by the contact of the substrate 24 with the magnetic circuit component 51.

  In the above example, the fixing structure by the protrusion 53 and the soldering portion 54 is applied to the arc-shaped magnetic circuit component 51 of the second embodiment, but the fixing structure by the protrusion 53 and the soldering portion 54 is used. You may apply to the cylindrical magnetic circuit component 51 of Embodiment 1. FIG.

Embodiment 6 FIG.
FIG. 10 is a sectional view showing a range switching device 2 according to Embodiment 6 of the present invention. A cylindrical magnetic circuit component 51 centering on the axis of the motor shaft 30 is integrated with a cylindrical case peripheral wall portion 272b. That is, the magnetic circuit component 51 is formed by extending the case peripheral wall portion 272 b toward the substrate 24. The magnetic circuit component 51 is composed of a case 272 and a single material. As a result, there is no gap between the magnetic circuit component 51 and the case peripheral wall portion 272b, and the distance L1 between the magnetic circuit component 51 and the case peripheral wall portion 272b is zero. Further, the distance L2 between the magnetic circuit component 51 and the plate 371 is equal to or less than each distance from the output shaft sensor 44 to the case peripheral wall portion 272b, the plate 371, and the magnetic circuit component 51. Other configurations are the same as those in the first embodiment.

  In such a range switching device 2, since the magnetic circuit component 51 is integrated with the case peripheral wall portion 272b, there is no need to manufacture the magnetic circuit component 51 alone, and the number of components can be reduced. The assembly man-hour of the switching device 2 can be reduced. Further, since there is no gap between the magnetic circuit component 51 and the case peripheral wall portion 272b, the amount of leakage magnetic flux from the motor 21 to the outside can be further reduced.

  In the above example, the cylindrical magnetic circuit component 51 is integrated with the case peripheral wall portion 272b. However, the arc-shaped magnetic circuit component 51 may be integrated with the case peripheral wall portion 272b. In this case, the magnetic circuit component 51 is disposed between the rotor 29 and the output shaft sensor 44 when viewed along the axial direction of the motor 21. That is, in this case, the magnetic circuit component 51 is disposed only on the output shaft sensor 44 side as viewed from the motor shaft 30 and is not disposed on the opposite side to the output shaft sensor 44 side. Even if it does in this way, reduction of a number of parts and an assembly man-hour can be aimed at, and the quantity of the leakage magnetic flux from the motor 21 can further be reduced. In addition, the weight of the range switching device 2 can be reduced by reducing the weight of the magnetic circuit component 51.

Embodiment 7 FIG.
FIG. 11 is a sectional view showing a range switching device 2 according to Embodiment 7 of the present invention. A cylindrical magnetic circuit component 51 centered on the axis of the motor shaft 30 is integrated with a plate 371 of the internal gear fixing member 37. That is, the magnetic circuit component 51 is a portion where the outer peripheral portion of the plate 371 is extended toward the case peripheral wall portion 272b. The magnetic circuit component 51 is composed of an internal gear fixing member 37 and a single material. As a result, there is no gap between the magnetic circuit component 51 and the plate 371, and the distance L2 between the magnetic circuit component 51 and the plate 371 is zero. Further, the distance L1 between the magnetic circuit component 51 and the case peripheral wall portion 272b is equal to or less than each distance from the output shaft sensor 44 to the case peripheral wall portion 272b, the plate 371, and the magnetic circuit component 51. Other configurations are the same as those in the first embodiment.

  In such a range switching device 2, since the magnetic circuit component 51 is integrated with the plate 371, it is not necessary to manufacture the magnetic circuit component 51 alone, and the number of components can be reduced. 2 assembly man-hours can be reduced. Moreover, since there is no gap between the magnetic circuit component 51 and the plate 371, the amount of leakage magnetic flux from the motor 21 to the outside can be further reduced.

  In the above example, the cylindrical magnetic circuit component 51 is integrated with the plate 371, but the arc-shaped magnetic circuit component 51 may be integrated with the plate 371. In this case, the magnetic circuit component 51 is disposed between the rotor 29 and the output shaft sensor 44 when viewed along the axial direction of the motor 21. That is, in this case, the magnetic circuit component 51 is disposed only on the output shaft sensor 44 side as viewed from the motor shaft 30 and is not disposed on the opposite side to the output shaft sensor 44 side. Even if it does in this way, reduction of a number of parts and an assembly man-hour can be aimed at, and the quantity of the leakage magnetic flux from the motor 21 can further be reduced. In addition, the weight of the range switching device 2 can be reduced by reducing the weight of the magnetic circuit component 51.

Embodiment 8 FIG.
FIG. 12 is a sectional view showing a range switching device 2 according to the eighth embodiment of the present invention. A cylindrical magnetic circuit component 51 centering on the axis of the motor shaft 30 is integrated with the stator core 281. That is, the stator core 281 is a laminated body of a plurality of magnetic plates, and among the plurality of magnetic plates of the stator core 281, a portion in which the outer peripheral portion of at least one magnetic plate is extended toward the plate 371 in the order closer to the plate 371. Magnetic circuit component 51 is provided. In this example, two magnetic plates facing the plate 371 side of the stator core 281 are bent to extend the outer peripheral portions of the two magnetic plates toward the plate 371. Thereby, the magnetic plate of the stator core 281 and the magnetic circuit component 51 are a single material. The distance L1 between the magnetic circuit component 51 and the case peripheral wall portion 272b and the distance L2 between the magnetic circuit component 51 and the plate 371 are determined from the output shaft sensor 44, the case peripheral wall portion 272b, the plate 371, and the magnetic circuit. Each distance to the component 51 is less than each distance. Other configurations are the same as those in the first embodiment.

  In such a range switching device 2, since the magnetic circuit component 51 is integrated with the stator core 281, it is not necessary to independently manufacture the magnetic circuit component 51, and the number of components can be reduced. 2 assembly man-hours can be reduced. In addition, since there is no gap between the magnetic circuit component 51 and the stator core 281, the amount of leakage magnetic flux from the motor 21 to the outside can be further reduced.

  In the above example, the cylindrical magnetic circuit component 51 is integrated with the stator core 281, but the arc-shaped magnetic circuit component 51 may be integrated with the stator core 281. In this case, the magnetic circuit component 51 is disposed between the rotor 29 and the output shaft sensor 44 when viewed along the axial direction of the motor 21. That is, in this case, the magnetic circuit component 51 is disposed only on the output shaft sensor 44 side as viewed from the motor shaft 30 and is not disposed on the opposite side to the output shaft sensor 44 side. Even if it does in this way, reduction of a number of parts and an assembly man-hour can be aimed at, and the quantity of the leakage magnetic flux from the motor 21 can further be reduced. In addition, the weight of the range switching device 2 can be reduced by reducing the weight of the magnetic circuit component 51.

The present invention is not limited to the above-described embodiments, and can be appropriately modified and omitted without departing from the scope of the invention.
Further, the range switching device according to the present invention is not limited to the range switching device for a vehicle, and may be, for example, a driving unit for various actuators for a vehicle, a driving unit for an industrial robot, or a driving unit for a machine tool. Can be applied.

  2 range switching device, 21 motor, 22 deceleration mechanism, 23 range switching, 24 substrate, 25 housing, 28 stator, 29 rotor, 30 motor shaft, 44 output shaft sensor, 46 screw (fastener), 51 magnetic circuit Parts, 52 Arm part, 53 Protrusion, 53a Pedestal part, 53b Protruding part, 54 Soldering part, 231 Output shaft, 271b Part fixing part (convex part), 271c Caulking part, 272 Case, 272b Case peripheral wall part, 371 plate.

Claims (11)

A motor having a stator, a rotor rotatable with respect to the stator, and a motor shaft that rotates integrally with the rotor;
A range switching unit having an output shaft arranged at a position radially away from the motor shaft;
A reduction mechanism that includes a plate that is a magnetic member facing each of the rotor and the stator in the axial direction of the motor, and transmits the rotational force of the motor shaft to the output shaft by decelerating the rotation of the motor shaft;
A substrate on which an output shaft sensor, which is a non-contact magnetic sensor facing the axial end surface of the output shaft, is provided; and the motor, the range switching unit, the speed reduction mechanism unit, and a housing that supports the substrate. Prepared,
The housing has a case that is a magnetic member having a case peripheral wall portion that covers an outer peripheral portion of the stator,
A range switching device in which a magnetic circuit component, which is a magnetic member, is provided between the case peripheral wall and the plate.   2. The range switching device according to claim 1, wherein the magnetic circuit component has a cylindrical shape centered on the axis of the motor shaft when viewed along the axial direction of the motor.   2. The range switching device according to claim 1, wherein the shape of the magnetic circuit component is an arc shape centered on the axis of the motor shaft when viewed along the axial direction of the motor. The magnetic circuit component is provided with an arm portion protruding from the magnetic circuit component,
The range switching device according to any one of claims 1 to 3, wherein the arm portion is fastened together with the substrate to the housing by a fastener. The magnetic circuit component is provided with an arm portion protruding from the magnetic circuit component,
The housing is provided with a resin convex portion,
The range switching device according to any one of claims 1 to 3, wherein a tip portion of the convex portion is a caulking portion that fixes the arm portion to the convex portion. The magnetic circuit component is provided with a protrusion,
The substrate is provided with a through hole into which the protrusion is inserted,
The range switching according to any one of claims 1 to 3, wherein the substrate is fixed to the magnetic circuit component by a soldering portion interposed between an inner surface of the through hole and the protrusion. apparatus. The protrusion has a pedestal portion and a protruding portion protruding from the pedestal portion,
The protrusion is thinner than the pedestal,
The range switching device according to claim 6, wherein the substrate is placed on the pedestal portion in a state where the protruding portion is inserted into the through hole.   The range switching device according to any one of claims 1 to 3, wherein the magnetic circuit component is integrated with the peripheral wall portion of the case.   The range switching device according to any one of claims 1 to 3, wherein the magnetic circuit component is integrated with the plate. The stator has a stator core that is a magnetic member, and a stator coil provided on the stator core,
The range switching device according to any one of claims 1 to 3, wherein the magnetic circuit component is integrated with the stator core.   The distance between the case peripheral wall portion and the magnetic circuit component, and the distance between the plate and the magnetic circuit component are from the output shaft sensor to the case peripheral wall portion, the plate, and the magnetic circuit component. The range switching apparatus as described in any one of Claims 1-10 which is below each distance.

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